Heat-coil and protector unit.



No. 886,374. PATENTED MAY 5, 1908.

W. KAISLING'. HEAT. 0011 AND PROTEGTOR UNIT.

APPLICATION FILED MAY 29, 1905.

iliamKaz'slz'ry witnesses.- fizvenion jiioflnqy;

UNITED s'rar ns Pagans. OFFICE.

WILLIAM KAISLING, OF CHICAGO, ILLINOIS, ASSIGNOR TO FRANK B. COOK, OF CHICAGO,

ILLINOIS.

HEAT-COIL AND PROTECTOR Specification of Letters Patent.

. Patented. May 5, 1908.

Application filed May 29, 1905. Serial No. 262,717.

To all whom it may concern:

Be it Known that 1, WILLIAM KAIsLING,

a citizen of the United States of America, and resident of Chicago, county of Cook, and State of Illinois, have invented a new and useful Improvement in Heat-Coils and Protector Units, of which the following is a specification.

My invention ertains to heat coils as used in telephone eXc ange systems, and refers to the manner of assembling the coil and circuits upon a mount, to details of the mounting of the assembled coil and springs, and to the circuits of the mounting springs and the heat coil itself, the latter wlth reference particularly to' the conductors wound upon the heat-responsive portion of the heat coil.

In my invention I propose to use but one heat (Oll per telephone line, instead of using one per conductor as is the present custom,

the two conductorsof a metallic circuit telephone line being taken through the one heat coil, and either being effective to secure the operation of the heat coil in the event of excess current; I propose also to assemble the apparatus pertaining to a single telephone line as a complete unit, ready for the connection of the telephone-line conductors, and

then to mount this complete unit upon such mounting plate may be convenient, the assembly being in such groups of units as may be desired.

.A further provisioi'i in my protector unit is found in the provision for avoiding a destruce tive arc being formed arrossthe break in the line made by the operation ofthe heat coil.

5 on the dotted line A A of Fig. 1; Fig. 4

shows a section on the dotted line B-B of Fig. 2; Fig. 5 shows an elevation similar to between springs 25 and 26 and the heat coil 30, unnecessary parts of the protector unit being omitted from this figure. Fig. 6 shows details of the clip used as terminals 31 32 33 34, showing the sheet-metal blank and the com leted formed part, and Fig. 7 shows detail of the two windings of the compound heat-coil unit. 1

Referring to Figs. 1 and 2, 10 is a strip of steel forming the mounting base for they assembly of the protector unit; Fig. 1 shows the edge of this strip of steel and Fig. 2 shows the side, showing that at the lower end the strip is bifurcated, while Fig. 1 shows that a considerable clearance is provided on each side of the bifurcated end'of the strip; this construction permits a bolt or screw to be started in any desired position or location to mount the protector unit; then the bifurcated end of the steel mounting baselO may be placed around thelbody of the screw and when the screw is tightened the assembled protector will be held securely in position; in a group of protectors thus mounted, any one may be removed by loosening its clamging screw, and a new protector unit may rep ace the one removed by being placed in position and then clam ed by the same screw. In an installation 0 rotectors, vacantpositions may be provided? for protector units for future needs, and the units may be added one by one as needed.

Upon the mounting base 10 are mounted springs adapted to receive and hold the heat coil and to furnish the necessary circuit requirements, the springs being held by the insula'ting block 11 upon the u per end of the steel mountingbase 10, and the'series of insulating blocks and washers 12, held by the bolts and nuts 13, and clamping the lower ends of all of the long springs. Springs 20 and 21 are intended for direct connection to, the conductors of the tele hone line after entering the central office tirough fuses in the usual manner; springs 25 and 26 are intended for direct connection to the conductors leading tothe switchboard; springs 23 and 24 form intermediate parts of the circuits of the telephone line passing through the protector unit s irin 22 is a roundin s )rin in elec.

7 L h h h! trical contact with the mounting base 10, which is grounded n pract ce when the protector umt 1s lnstalled tor service; spring 27 simple tension spring required for the actuation of the operating parts of the heat coil, and formin g also, if desired, a portion of an alarm circuit, as will be described later.

The heatcoil 30 has four terminals, 31, 32, 3e, and two se arate windings 30 and 30", indicated in the section of the ,coil in Fig. 3, these twowindings being connected,

respectively, between the terminals 3.1 32 aged 3334, and being so wound upon the,

i-iore or spool 50 of the heat coil as to be cumulatively inductive when currents pass simul-g taneously from terminals 31 and 33'to terminals 32 and 34, and differentially inductive when currents pass simultaneously from ter' minals 32 to 31', and33 to 34; the two ings are equal in turns, and therefore when inductive they are practicallydifferentially non-inductive. I

spring 25 with terminal-32; terminal 33 and spring- 26 wit 3 d 2- square in cross section, to 'fflQlll'biLlDG the'proper connections between its terminals"-'and=the.

springs designed to hold it, by insuring a greater likelihood of register.

v passes to spring 20, thence by contact at 29 to the upper end of spring 24', which is in. contact with terminal 31 of the heat coil30,

The circuit of the telephoneline through the assembled and mounted protector unit is as follows: Entering the central ofiice'from the substation telephone, one limb of the line through which heat coil the circuit passes by one of the windings to terminal 32 and thence" by spring 25 to the switchboard conductor attached 'to spring 25; returning from the switchboard by the other limb of the line, the

I through a'contact similar to 29,to spring21 propelled by the pin 35-when that 1n islrea and thus to the-remaining-.limb of the'line connecting with the substation telephone. I

The heat coil 30' contains a pin35 passing through the core of the heat vcoil and pressed inwardly by the tension spring 2,7, and held against an inward motion bysome-fun'ction of the heat coil'3O so that excess heat within the heat coil30 would cause the-pin 35 to be released'and would permit motion-of the in 35 under the influence of the spring-27; t is obtained by the use of-a, fusible metal or solder as shown at SF in Fig. 7 melting under undue heat, or a wax connection which may be softened by, heat to permit a,.yielding, or

any other possible ,or preferred method. The

plunger 36 is snpported by the steel mount mg base 10 and 1s adapted to be engaged and eased-by the action of heat in the eaticoil 30 and then propelled by the spring 27. The

spring 22, grounded by contactlwith the spri ig 22 thenwill lift; spring '20;from 'sp vheat coil is'adaptable for use again by mounting base 10, lies adjacent to the plun-i ger 36, and is adapted to be actuated by that ,plungerwhen the plunger is propelled by the pin35 under pressure from SPIIII $27; I

eitherof them, become so greatzasto cause undue heat to be generated within'thejhea't coil, then the. pin 35 will be 'releas'edfwillbe propelledinwardly by the-spring 27, willen-ll gage the -plunger'i fij-w l'l cause that plunger to lift the spring 22-into engagement1w1thboth 'sprin s20and 21 (see F1g.= 3c); and thus:

will groun .both limbs of the tele hone line 0 on the side-of the heat coilgtowar the sub-. stat-ion telephone 1 continumg'inl- 1ts mot1on,.

241,-," bmakia the'eontaet ates; rident-g id}- liftsp ing 21 from'spring23j-breakiriga aim g5 ilar contact; E thus the "line leading the sub- I station telephone-is first grounde'd 'and then disconnected frb he fceritralxoflice'jequip 1 enu 1"15 I p l The circuit through the heat coil-30; through 9 which current flowed toheat the'coil to'cause I l the action above"-xdescribed, -now is inter-v rupted-; regard le ss"of what mighthave been ,the" source of. that current; the terminals 31- a'nd33 of the heat'coil are stillinelectrical "connection with springs 23and 24 ,but springs 23 and 24 are. isolated from other conductors.

The currents throughthe-heat coil therefore are interrupted, and the heat coil cools; I the length of pin 35 is so gaged that the cooled re- I versing' its positron in'th'e springs? A carbon arrester, with air gap to ground,-

' is a part ofthe modern tele hone roteotive I circuit passes to spring 26, terminal, 34, through the remaining winding of the heat" coil to terminal 33, thence by spring 23 and"v fork 'm'embers37 and 38 these'two members 1 0 clasp acarbon block, 41; two additional carbon blocks .42 and 43, are adapted to make I electrical connection'with the hue conductor, I

springs 23 and24, which conductor springs tend to press the carbon blocks 42 and 43 into 1'15 contact with 41, but two mica separators 39 i 4 and40 are interposed in the manner usual in telephone practice. function is well known in-the art, and may be I do not wishto li f 1 .Inaprotectorun'it, amountingbase,con- 130 I -Th e operation of'the assemble protector 7 I unit is asfollows: If, now, the currents flow-f ing in the windings of the heatcoll 30, 'o'r n' I .5

ductor springs ,insulatingly held upon said mounting base, a heat coil held by said springs, carbon blocks and separators held by said springs, the whole forming heat coil and carbon arrester protection for one telephone line, and means in connection with said mounting base for mounting the protector unit upon a supporting member independently of similar protector units, substantially as described.

2. In a rotector unit, a mounting base having a ifurcated end adapted to be clamped by a bolt or screw, and protectivedevices mounted upon said mounting base adapted to furnish complete equipment of heatcoil and carbon arrester protection for one telephone line inde endently of other similar units, substantially as described.

3. In a protector unit, apair of fixed conductor elements, a pairof movable con uctor elements normally in contact with said fixed elements and forming with said fixed. elements arts of the continuous limbs of a. telephone ine;-i-a heat-coil'element; agrounding spring; and means controlling sa ground- I mg spring when said heat-coil elementoperates and causing said groundin spring to en, gage and ground said mova 1e conductor elements and to lift said movable conductor elements from said fixed conductor elements, substantially as described.

4. In a protector unit, a fixed line-con-- ductor element; a movable line conductor element normally in contact with said fixed line-conductor element; a heat-coil element;

a grounding spring; and means controlling said grounding spring when said heat-coil elemento crates, and causing said grounding "s ring rst to engage said movable line-c011 uctor element and then to break the contact 4 normally existing between said lineconductor elements, substantially as described. 5. In a protector unit, a heat coil having two windings; clamping conductor sp sustaining and holding said heat coil in pear v tion and making electricalcontact with the terminals of the windings of the heat coil;

cluded separately in the two limbs of the line. respectively, and means by which undue the actuation of said heat coiland the consequent grounding of bothof said limbs of the hue and the consequent interruption of both scribed.

windings in said. heat coil; terminals for said windings and mounted upon said heatcoil; supporting conductor springs contacting electrically with said terminals and holding said heat coil and adapted to form portions of the limbs of a telephone line; and circuits wherec -uded in'the two limbs of the telephone line, substantiall as described. g

7. In a t ermo-electric device, a heat responsive unit, an electrical conductor in said rent including a part thereof said electrical conductor inlaid means adaptelfito be made operative by said heat-responsive unit and ada ted first to esrupt the path first mentioned, substantially as described. p p

8. Ina thermo-electric device, a heat-reuctUr's insaid heat-responsiveunit; a plu rality of main paths for electric current each including as-a part thereof one of said elecand means adapted to be made operative by said heat-responsive unit and a to establish an auxiliary path for each of said main paths and then to interrupt all of said main paths," substantially as described.

.. Si ned 'byme at,-C hic and tateof Illinois int e'presence of'twb witnesses J -WILLIAM'KAISLING.

' Witnesses:

- f s ear. G. McMnEm/j of said limbs of the line, substantially as de- 6. In a protector unit, a heat coil; two' heat-responsive unit, a path for electric cur 0, county of Cook circuits by which 'saidtwo windings are. in-

i' heating of either of said windings will cause b the two windings'of. the heat. coil are in 7' eat-responsive unit, and 

